don't want to be the god mom ?

so this girl who is a couple years younger than me (i'm 19) is pregnant and she asked me if I wanted to be her sons godmother and do a photo shoot when he's born.. not only do I hate pictures but I do feel that I'm not the one to be his God mom maybe I am looking into it too deeply but I feel like me and her are not that close for her to just ask me to do that ... I told her I feel honored and then I didn't say anything after that because I don't really know how to tell her that I shouldn't be the god mom, has anyone ever been in this situation before ? she doesn't really think things through and I feel like she just wants her baby to have a god mom without actually choosing the right person.. she told me that I stay out of trouble and I never have done anything wrong to her and she trust me so that's why she thinks I should be it.